
#include <iostream>
using namespace std;

int foo( ) {
	
	return 10;
}

int main( ) {
	const int& ri = 10;	// The ri is the nickname of 10.
	int&& rri = 10;		// The vlaue rri is the ture name of 10.

	const int& rf = foo();
	int&& rrf = foo();
	
	return 0;
}

